Al Hassan, an engineer with Rockland County Sewer District No. 1, oversees work on a sewer line replacement Thursday at the intersection of Union Road and Maple Avenue in Spring Valley.

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A half-mile stretch of Union Road will be closed to most traffic until April so new sewer pipes can be installed.

Since Tuesday, drivers seeking to use Union Road in Spring Valley have been detoured onto Twin Avenue. The closure is from Maple Avenue to Jasinksi Road, but Union remains open to local traffic, school buses, emergency vehicles and garbage trucks.

Al Hassan, an engineer with Rockland County Sewer District No. 1, said the agency is upgrading the area's sewer system, replacing 2,600 feet of 8- and 12-inch pipe with 21-inch line. It's also putting in new connections to three dozen ...